An Advance Approach to Reduce Handover Delay by Reducing Scanning Delay Using Media Independent Handover in 802.11

Real time applications like VOIP (Voice Over Internet Protocol) requires a high Quality of Service (QoS). To provide high QoS, handover efficiency is an important factor. In 802.11, Access Points (APs) are connected on different channels to avoid interference from neighboring APs. To successfully complete handover process, Mobile Node (MN) has to scan all channels which introduce high delays in handover process. Larger portions of delay in handover are due to scanning only. So, handover delays can be reduced by reducing scanning delays In this paper, we propose a new approach to reduce handover delay by reducing scanning delay. Our approach basically relies on the fact that APs which are nearer to MN should provide higher Signal Strength. In our approach, Media Independent Information Service (MIIS) Server stores the channel numbers on which APs are connected and the coordinates at where APs are placed. MN acquires this information from MIIS. MN calculates its own coordinates. Based on these coordinates MN will decide which AP to scan next. Here, MN may scan only one channel which reduces scanning delay greatly.